“Poisson d’Avril !”

Here is a habit in FRance on the 1st of April, that I don’t heard off anywhere else…
Of course everybody try to make jokes, TV, radio, teachers…
But childs spend the day to try to stick a paper fish in the back of the other without he or she mentioned it, and the fun is to see them walking with a paper fish in the back… and the better is to stick this fish on an adult’s back !!
Once the joke is found, everybody cry : “Poisson d’Avril !”…

So I decide to offer you a little fish to print and cut and stick where you want….

And what if fishes do the same ?

And you, di you yet know this French habit ? What do you do for April Fool ?